[Slider] Fix label pivots

Resolves #4509

GIT_ORIGIN_REV_ID=a26da16d8389df1de090c737c50c6c1e12f77df8
PiperOrigin-RevId: 713697809

Author: pubiqq

lib/java/com/google/android/material/slider/BaseSlider.java

@@ -279,6 +279,15 @@ abstract class BaseSlider<
   private static final int LABEL_ANIMATION_EXIT_EASING_ATTR =
       R.attr.motionEasingEmphasizedAccelerateInterpolator;
 
+  private static final float TOP_LABEL_PIVOT_X = 0.5f;
+  private static final float TOP_LABEL_PIVOT_Y = 1.2f;
+
+  private static final float LEFT_LABEL_PIVOT_X = 1.2f;
+  private static final float LEFT_LABEL_PIVOT_Y = 0.5f;
+
+  private static final float RIGHT_LABEL_PIVOT_X = -0.2f;
+  private static final float RIGHT_LABEL_PIVOT_Y = 0.5f;
+
   @Dimension(unit = Dimension.DP)
   private static final int MIN_TOUCH_TARGET_DP = 48;
 
@@ -3276,6 +3285,8 @@ private ValueAnimator createLabelAnimator(boolean enter) {
   }
 
   private void updateLabels() {
+    updateLabelPivots();
+
     switch (labelBehavior) {
       case LABEL_GONE:
         ensureLabelsRemoved();
@@ -3300,6 +3311,29 @@ private void updateLabels() {
     }
   }
 
+  private void updateLabelPivots() {
+    // Set the pivot point so that the label pops up in the direction from the thumb.
+    final float labelPivotX;
+    final float labelPivotY;
+
+    final boolean isVertical = isVertical();
+    final boolean isRtl = isRtl();
+    if (isVertical && isRtl) {
+      labelPivotX = RIGHT_LABEL_PIVOT_X;
+      labelPivotY = RIGHT_LABEL_PIVOT_Y;
+    } else if (isVertical) {
+      labelPivotX = LEFT_LABEL_PIVOT_X;
+      labelPivotY = LEFT_LABEL_PIVOT_Y;
+    } else {
+      labelPivotX = TOP_LABEL_PIVOT_X;
+      labelPivotY = TOP_LABEL_PIVOT_Y;
+    }
+
+    for (TooltipDrawable label : labels) {
+      label.setPivots(labelPivotX, labelPivotY);
+    }
+  }
+
   private boolean isSliderVisibleOnScreen() {
     final Rect contentViewBounds = new Rect();
     ViewUtils.getContentView(this).getHitRect(contentViewBounds);

lib/java/com/google/android/material/tooltip/TooltipDrawable.java

@@ -107,7 +107,7 @@ public void onLayoutChange(
 
   private float tooltipScaleX = 1F;
   private float tooltipScaleY = 1F;
-  private final float tooltipPivotX = 0.5F;
+  private float tooltipPivotX = 0.5F;
   private float tooltipPivotY = 0.5F;
   private float labelOpacity = 1.0F;
 
@@ -366,15 +366,24 @@ public void setLayoutMargin(@Px int layoutMargin) {
    * @param fraction A value between 0.0 and 1.0 that defines how "shown" the tooltip will be.
    */
   public void setRevealFraction(@FloatRange(from = 0.0, to = 1.0) float fraction) {
-    // Set the y pivot point below the bottom of the tooltip to make it look like the
-    // tooltip is translating slightly up while scaling in.
-    tooltipPivotY = 1.2F;
     tooltipScaleX = fraction;
     tooltipScaleY = fraction;
     labelOpacity = AnimationUtils.lerp(0F, 1F, 0.19F, 1F, fraction);
     invalidateSelf();
   }
 
+  /**
+   * Set the pivot points for the tooltip.
+   *
+   * @hide
+   */
+  @RestrictTo(LIBRARY_GROUP)
+  public void setPivots(float pivotX, float pivotY) {
+    this.tooltipPivotX = pivotX;
+    this.tooltipPivotY = pivotY;
+    invalidateSelf();
+  }
+
   /**
    * Should be called to allow this drawable to calculate its position within the current display
    * frame. This allows it to apply to specified window padding.
@@ -486,7 +495,7 @@ private float calculatePointerOffset() {
   private EdgeTreatment createMarkerEdge() {
     float offset = -calculatePointerOffset();
     // The maximum distance the arrow can be offset before extends outside the bounds.
-    float maxArrowOffset = (float) (getBounds().width() - arrowSize * Math.sqrt(2)) / 2.0f;
+    float maxArrowOffset = (float) ((getBounds().width() - arrowSize * Math.sqrt(2)) / 2.0f);
     offset = Math.max(offset, -maxArrowOffset);
     offset = Math.min(offset, maxArrowOffset);
     return new OffsetEdgeTreatment(new MarkerEdgeTreatment(arrowSize), offset);